No such weapons were used and none been found.
A.none have been
B.none has
C.no other has been
D.no others been
A.wiped out
B.reached out
C.worked out
D.hung out
A.transmit
B.transfer
C.transform
D.transport
A.has been working; has written
B.is working; writes
C.has worked; has been writing
D.works; is writing
The relative stability of the human population has been upset by ______.
A.the proportion of the reproductive age group
B.the influenza epidemic
C.advances in medical science
D.the Black Death in Europe
Bees do two kinds of【B4】to tell other bees of their【B5】of food. First, there is a round dance.【B6】this dance, the bee moves in a【B7】inside the hive. The round dance is used【B8】the food is close by. The food must not be more than ten meters【B9】If a bee comes back and dance a round dance, other bees know they must go out and look nearby for food. The bees also【B10】the bee that has found the food. The smell tells them what kind of flower to【B11】After watching the round dance and smelling the bee【B12】has found the food, the other bees can find the other source.
A second kind of dance【B13】by the bee is a tail-wagging dance. In this dance, the bee wiggles the【B14】of its body as it moves in a【B15】line. The tail-wagging dance is used when the food is far away. The food must be【B16】ten meters away. The bees know from the speed of the tail-wagging dance just how far away the food source is. The line the bee dances on shows the direction that the bees【B17】fly into find the food. In the tail-wagging dance, the bees also smell the bee【B18】has found the food. The smell tells them what kind of flowers to look for. After watching the tail-wagging dance and smelling the bee that has found the food, the other bees know【B19】things. They know how far【B20】fly, what direction to fly in, and what kind of flowers to look for.
【B1】
A.for food
B.for eating
C.to eat
D.for eating food
A.The epidemic has been brought under control.
B.There are signs of progress in the peace process.
C.Great improvements are being made in its capital.
D.There's little hope of bringing the conflict to an end.
A.It has become a clumsy giant.
B.The city has suffered from long-time famine.
C.There was epidemic disease that time.
D.It has been set on fire.
为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!